Singapore took all the street vendors off the sidewalks decades ago, and put them in “hawker centers”, which have sanitary facilities. I’m pretty sure I’ve been the Ang Mo Kio center, some thirty years ago.
I went to that one in 2012 - everything I had was great. People say Maxwell is the best center, but I haven't tried it yet. I usually end up at Ion Orchard or one of the Food Republic centers - or Lau Pa Sat if I'm near downtown.
But fish soup isn't on my go-to list. :)